Orthographic Camera - Arnold User Guide
The Arnold orthographic camera node has no attributes, since it merely creates an orthographic view based on the current viewport.
The Common Camera Parameters page has more details about the controls. The additional attributes are shown below.
Note:
Depth of field is not available for this camera type.
This camera node provides an orthographic view (no perspective, so objects do not decrease in size if they are further from the camera).
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| perspective camera | orthographic camera |